package com.heima.wemedia.service.impl;

import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.heima.common.constants.WemediaConstants;
import com.heima.common.constants.WmNewsMessageConstants;
import com.heima.common.exception.CustomException;
import com.heima.model.common.dtos.PageResponseResult;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.wemedia.dtos.WmNewsDto;
import com.heima.model.wemedia.dtos.WmNewsPageReqDto;
import com.heima.model.wemedia.pojos.WmMaterial;
import com.heima.model.wemedia.pojos.WmNews;
import com.heima.model.wemedia.pojos.WmNewsMaterial;
import com.heima.utils.thread.WmThreadLocalUtils;
import com.heima.wemedia.mapper.WmMaterialMapper;
import com.heima.wemedia.mapper.WmNewsMapper;
import com.heima.wemedia.mapper.WmNewsMaterialMapper;
import com.heima.wemedia.service.WmNewsAutoScanService;
import com.heima.wemedia.service.WmNewsService;
import com.heima.wemedia.service.WmNewsTaskService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.*;
import java.util.stream.Collectors;

@Service
@Slf4j
@Transactional
public class WmNewsServiceImpl extends ServiceImpl<WmNewsMapper, WmNews> implements WmNewsService {

    @Autowired
    private WmNewsMaterialMapper wmNewsMaterialMapper;

    @Autowired
    private WmMaterialMapper wmMaterialMapper;

    @Autowired
    private WmNewsAutoScanService wmNewsAutoScanService;

    /**
     * 条件查询文章列表
     * @param dto
     * @return
     */
    @Override
    public ResponseResult findList(WmNewsPageReqDto dto) {
        // 1. 检查参数
        dto.checkParam(); // 分页检查

        // 2. 分页条件查询
        IPage page = new Page(dto.getPage(), dto.getSize());
        LambdaQueryWrapper<WmNews> lambdaQueryWrapper = new LambdaQueryWrapper();

        // 2.1 状态精准查询
        if(dto.getStatus() != null) {
            lambdaQueryWrapper.eq(WmNews::getStatus, dto.getStatus());
        }

        // 2.2 频道精准查询
        if(dto.getChannelId() != null) {
            lambdaQueryWrapper.eq(WmNews::getChannelId, dto.getChannelId());
        }

        // 2.3 时间范围查询
        if(dto.getBeginPubDate() != null && dto.getEndPubDate() != null) {
            lambdaQueryWrapper.between(WmNews::getPublishTime, dto.getBeginPubDate(), dto.getEndPubDate());
        }

        // 2.4 关键词的模糊查询
        if(StringUtils.isNoneBlank(dto.getKeyword())) {
            lambdaQueryWrapper.like(WmNews::getTitle, dto.getKeyword());
        }

        // 2.5 查询当前登录人的文章
        lambdaQueryWrapper.eq(WmNews::getUserId, WmThreadLocalUtils.getUser().getId());

        // 2.6 发布时间倒序查询
        lambdaQueryWrapper.orderByDesc(WmNews::getPublishTime);

        page = page(page, lambdaQueryWrapper);

        // 3. 返回结果
        ResponseResult responseResult = new PageResponseResult(dto.getPage(), dto.getSize(), (int) page.getTotal());
        responseResult.setData(page.getRecords());
        return responseResult;
    }

    @Autowired
    private WmNewsTaskService wmNewsTaskService;

    /**
     * 发布/修改文章或发布为草稿
     * @param dto
     * @return
     */
    @Override
    public ResponseResult submitNews(WmNewsDto dto) {

        // 1. 参数校验
        if(dto == null || dto.getContent() == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        // 2. 保存或修改文章

        WmNews wmNews = new WmNews();
        // 属性拷贝 属性名词和类型相同才能拷贝
        BeanUtils.copyProperties(dto, wmNews);
        // 封面图片  list---> string
        if(dto.getImages() != null && dto.getImages().size() > 0) {
            String imageStr = StringUtils.join(dto.getImages(), ",");
            wmNews.setImages(imageStr);
        }
        // 如果当前封面为自动类型 -1
        if(dto.getType().equals(WemediaConstants.WM_NEWS_TYPE_AUTO)) {
            wmNews.setType(null);
        }
        saveOrUpdateWmNews(wmNews);

        // 3. 判断是否为草稿, 如果是草稿, 结束当前方法
        if(dto.getStatus().equals(WmNews.Status.NORMAL.getCode())) {
            return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);
        }

        // 4. 保存文章内容图片和素材的关系
        // 提取文章内容中的图片信息
        List<String> materials = ectractUrlInfo(dto.getContent());

        saveRelativeInfoForContent(materials, wmNews.getId());

        // 5. 保存文章封面图片和素材的关系, 如果当然布局是自动, 需要匹配封面图片
        saveRelativeInfoForCover(dto, wmNews, materials);

        // 审核文章
        // wmNewsAutoScanService.autoScanWmNews(wmNews.getId());
        wmNewsTaskService.addNewsToTask(wmNews.getId(), wmNews.getPublishTime());

        return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);
    }

    /**
     * 第一个功能：如果当前封面类型为自动，则设置封面类型的数据
     * 匹配规则：
     * 1，如果内容图片大于等于1，小于3  单图  type 1
     * 2，如果内容图片大于等于3  多图  type 3
     * 3，如果内容没有图片，无图  type 0
     *
     * 第二个功能：保存封面图片与素材的关系
     * @param dto
     * @param wmNews
     * @param materials
     */
    private void saveRelativeInfoForCover(WmNewsDto dto, WmNews wmNews, List<String> materials) {
        // 如果当前封面类型为自动，则设置封面类型的数据
        List<String> images = dto.getImages();

        if(dto.getType().equals(WemediaConstants.WM_NEWS_TYPE_AUTO)) {
            // 多图
            if(materials.size() >= 3) {
                wmNews.setType(WemediaConstants.WM_NEWS_MANY_IMAGE);
                images = materials.stream().limit(3).collect(Collectors.toList());
            } else if(materials.size() >= 1 && materials.size() < 3) {
                // 单图
                wmNews.setType(WemediaConstants.WM_NEWS_SINGLE_IMAGE);
                images = materials.stream().limit(1).collect(Collectors.toList());
            } else {
                // 无图
                wmNews.setType(WemediaConstants.WM_NEWS_NONE_IMAGE);
            }

            // 修改文章
            if(images != null && images.size() > 0) {
                wmNews.setImages(StringUtils.join(images, ","));
            }
            updateById(wmNews);

            // 保存封面图片与素材的关系
            if(images != null && images.size() > 0) {
                saveRelativeInfo(images, wmNews.getId(), WemediaConstants.WM_COVER_REFERENCE);
            }
        }
    }

    /**
     * 处理文章内容图片与素材的关系
     * @param materials
     * @param newsId
     */
    private void saveRelativeInfoForContent(List<String> materials, Integer newsId) {
        saveRelativeInfo(materials, newsId, WemediaConstants.WM_CONTENT_REFERENCE);
    }

    /**
     * 保存文章图片与素材的关系到数据库中
     * @param materials
     * @param newsId
     * @param type
     */
    private void saveRelativeInfo(List<String> materials, Integer newsId, Short type) {
        // 参数校验
        if(materials != null && !materials.isEmpty()) {
            // 通过图片的url查询素材的id
            List<WmMaterial> dbMaterials = wmMaterialMapper.selectList(Wrappers.<WmMaterial>lambdaQuery().in(WmMaterial::getUrl, materials));

            // 判断素材是否有效
            if(dbMaterials == null ||dbMaterials.size() == 0) {
                // 提示调用者素材失效(还可以进行数据回滚)
                throw new CustomException(AppHttpCodeEnum.MATERIAL_REFERENCE_FAIL);
            }

            // 判断素材和数据库素材是否一致
            if(dbMaterials.size() != materials.size()) {
                // 提示调用者素材失效(还可以进行数据回滚)
                throw new CustomException(AppHttpCodeEnum.MATERIAL_REFERENCE_FAIL);
            }

            List<Integer> idList = dbMaterials.stream().map(WmMaterial::getId).collect(Collectors.toList());

            // 批量保存
            wmNewsMaterialMapper.saveRelations(idList, newsId, type);
        }
    }

    /**
     * 提取文章内容中的图片信息
     * @param content
     * @return
     */
    private List<String> ectractUrlInfo(String content) {
        List<String> materials = new ArrayList<>();

        List<Map> maps = JSON.parseArray(content, Map.class);
        for(Map map : maps) {
            if(map.get("type").equals("image")) {
                String imgUrl = (String) map.get("value");
                materials.add(imgUrl);
            }
        }

        return materials;
    }

    /**
     * 保存或修改文章
     * @param wmNews
     */
    private void saveOrUpdateWmNews(WmNews wmNews) {
        // 属性补全
        wmNews.setUserId(WmThreadLocalUtils.getUser().getId());
        wmNews.setCreatedTime(new Date());
        wmNews.setSubmitedTime(new Date());
        // 默认上架
        wmNews.setEnable((short) 1);

        if(wmNews.getId() == null) {
            // 保存文章
            save(wmNews);
        } else {
            // 修改文章
            wmNewsMaterialMapper.delete(Wrappers.<WmNewsMaterial>lambdaQuery().eq(WmNewsMaterial::getNewsId, wmNews.getId()));
            updateById(wmNews);
        }
    }

    @Autowired
    private KafkaTemplate<String, String> kafkaTemplate;

    /**
     * 文章上下架
     * @param dto
     * @return
     */
    @Override
    public ResponseResult downOrUp(WmNewsDto dto) {

        // 1. 校验参数
        if(dto.getId() == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        // 2. 判断文章是否存在
        WmNews wmNews = getById(dto.getId());
        if(wmNews == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.DATA_NOT_EXIST, "文章不存在");
        }

        // 3. 判断文章是否已发布
        if(!wmNews.getStatus().equals(WmNews.Status.PUBLISHED.getCode())) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID, "当前文章不是发布状态, 不能上下架");
        }

        // 4. 修改文章enable(上下架状态)
        if(dto.getEnable() != null && dto.getEnable() > -1 && dto.getEnable() < 2) {
            update(Wrappers.<WmNews>lambdaUpdate().set(WmNews::getEnable, dto.getEnable())
                    .eq(WmNews::getId, wmNews.getId()));

            // kafka 发送消息, 通知Article端修改文章配置
            if(wmNews.getArticleId() != null) {
                Map<String, Object> map = new HashMap<>();
                map.put("articleId", wmNews.getArticleId());
                map.put("enable", dto.getEnable());
                kafkaTemplate.send(WmNewsMessageConstants.WM_NEWS_UP_OR_DOWN_TOPIC, JSON.toJSONString(map));
            }
        }
        return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);
    }
}
